BBC Four launched on 2 March 2002,[1] with a schedule running from 19:00 to 04:00. The channel shows "a wide variety of programmes including comedy, documentaries, music, international film, original programmes, drama and current affairs ... an alternative to programmes on the mainstream TV channels".[2] It is required by its licence to broadcast at least 100 hours of new arts and music programmes, 110 hours of new factual programmes and to premiere twenty international films each year.[3][4]

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BBC Four launched on 2 March 2002 at 19:00 GMT, having been delayed from the original planned 2001 launch. BBC Four began originally as a late schedule to BBC Two, before it received its own channel, along with BBC Three. Curiously, BBC Four had to launch before BBC Three as a result of the government delaying approval plans. The channel replaced BBC Knowledge, an educational and cultural channel which had undergone many changes throughout its lifetime; in its final format it carried a schedule of documentaries and art programming, essentially a test of the new BBC Four schedule. BBC Four would rebrand this channel, and bring it into line with the well recognised BBC One and Two brands at the same time. Planning for the new channel, along with the new BBC Three, had been in progress since October 2000; however, the incumbent government delayed approving the new BBC digital plans. The BBC Four plans were approved earlier, and as a result launched before BBC Three.

BBC Four was different from the old BBC Knowledge: the channel would be more heavily promoted with more new and original programming and the channel would not be broadcast 24 hours a day. This was because on the Freeviewdigital terrestrial platform, BBC Four is broadcast in a statistically multiplexed stream in Multiplex B that timeshares with the CBeebies channel (which is on air from 06:00 until 19:00). As a result, BBC Four broadcasts from 19:00 to around 04:00 each night, with an hour's down-time and promotions for CBeebies before the start of that channel's schedule.

On 12 May 2011, BBC Four was added to the Sky EPG in the Republic of Ireland on channel 230. It later moved to EPG 211 to free up space for new channels.[5]

BBC Four forms part of the BBC Vision group, and as a result, the channel controller is answerable to the head of this executive department: Emma Swain, as of 2012. The channel direction is determined by the channel's remit, set by royal charter and the corporation's governing body (the BBC Trust), and by the channel controller. In October 2013, following the departure of Richard Klein from the controllership, the management of the channel changed, with the role of Controller of BBC Four scrapped: from this point the Controller of BBC Two would have ultimate oversight of BBC Four as part of their role, absorbing some of the former duties of the Controller of BBC Four, but a new 'Channel Editor' post, reporting up to this controller, would be created to take day-to-day charge of Four. The controllers of BBC Four from 2002-2016 have been:

On 20 January 2016, Kim Shillinglaw announced that she had decided to leave the BBC as the Controller of BBC Two & BBC Four. As a result of the reorganisation, the post of Controller BBC Two and Four will close after her departure later in 2016.[12]

On 16 July 2013, the BBC announced that a high-definition (HD) simulcast of BBC Four would be launched by early 2014.[13] The channel launched on 10 December 2013, and rolled out nationwide up to June 2014 (as will BBC News HD and CBeebies HD).[14] The channel broadcasts on the BBC's new HD multiplex on Freeview and shares its stream with CBeebies HD as they both air at different times. Prior to launch, the majority of BBC Four's HD output was broadcast on the BBC HD channel before its closure on 26 March 2013.

BBC Four's primary role is to reflect a range of UK and international arts, music and culture. It should provide an ambitious range of innovative, high quality programming that is intellectually and culturally enriching, taking an expert and in-depth approach to a wide range of subjects.

On weekdays at 19:00 and weekends at 21:00, the channel shows a 30-minute global news programme called 100 Days + Monday–Thursday or an edition of World News Today Friday-Sunday, simulcast with and produced by BBC World News. Once 100 Days + ends it thought it will revert to World News Today. It screens a number of documentaries such as The Century of the Self and The Trials of Henry Kissinger. The channel is also home to many political travel shows such as Holidays in the Axis of Evil which features investigative journalism.

Drama has given the channel some of its most popular programmes, with The Alan Clark Diaries (2003) and Kenneth Williams: Fantabulosa! (2006) being among the highest rated, with over 800,000 viewers. The highly acclaimed Hattie, broadcast in 2011, holds the record for BBC4's best ever consolidated ratings of 2m / 8%.[17] Before that The Curse of Steptoe brought the channel its highest audience figures, estimated as 1.41 million viewers, a 7% share of multichannel audiences between 21:00 and 22:05, based on overnight returns.[18] The official audience figures for the broadcast, including time-shifting, were later published as 1,625,000.[19] Another notable production was a live re-make of the 1953 science-fiction serial The Quatermass Experiment, adapted from the original scripts into a single, two-hour version (though on the night it, in fact, underran considerably, lasting less than 1 hour 40 minutes), broadcast on the evening of Saturday 2 April 2005. Discounting BBC Four's previous live relays of theatrical Shakespeare productions, this was the first live made-for-television drama to be broadcast by the BBC for twenty years.

Another notable programme broadcast on BBC Four is Charlie Brooker's Screenwipe which contains reviews of current shows, as well as stories and commentary on how television is produced. The show is presented by broadcaster Charlie Brooker.

The channel is also curator and leader of the BBC Archive project whose aim is that the BBC's television archive is re-broadcast as much as appropriate so that the Archive can be enjoyed again and not isolated.[20]

Some output from BBC Four (documentaries rather than foreign films) was for a time repeated on BBC Two in a 'BBC Four on Two' branded area, although this was often in a late night broadcast slot after Newsnight and has since been discontinued.

According to BARB the comedy panel game QI has the highest ratings of any show on BBC Four.[21]

In 2012 Dirk Gently became the first continuing drama series produced for the channel.[22]

BBC Four is occasionally used to show live sports coverage. The channel aired additional games from the UEFA Euro 2016 football tournament, and temporarily extended its broadcast hours to show live action from the 2016 Summer Olympics.[23]

The channel's initial series of idents were generated dynamically reflecting the frequencies of the continuity announcers' voice or of backing music and were designed by Lambie-Nairn. As a result, no two idents were ever the same. The first continuity announcer was Zeb Soanes.

When the channel first started airing, it used the slogan "Everyone Needs A Place To Think", but the BBC stopped using this several months after the launch. However the BBC Four logo and above slogan can be found, engraved on benches along the South Bank in London, between the London Eye and Waterloo Bridge.

On 10 September 2005, the channel began showing new idents comprising a central BBC Four logo surrounded by four quadrants which show different stages of the same footage thus making for a sort of optical illusion; for example, a swimming pool where a person on an inflatable ring appears in the bottom-left corner, though ripples don't enter the remaining quarters. Although the image appears as one at the start of the ident, by the end it is clearly four separate images.